- use RESERVE_CONFIG_BUFFER. For defconfig this gives:

   text	   data	    bss	    dec	    hex	filename
   3627	      4	    120	   3751	    ea7	networking/arping.o.oorig
   3548	      4	     96	   3648	    e40	networking/arping.o.r14710
   3520	      4	     96	   3620	    e24	networking/arping.o

1 files changed, 5 insertions, 3 deletions

diff --git a/networking/arping.c b/networking/arping.c
index 782b61b64..4f1a2e2c5 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -71,7 +71,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
 {
         int err;
         struct timeval now;
-        unsigned char buf[256];
+        RESERVE_CONFIG_UBUFFER(buf, 256);
         struct arphdr *ah = (struct arphdr *) buf;
         unsigned char *p = (unsigned char *) (ah + 1);
 
@@ -105,6 +105,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
                 if (!(cfg&unicasting))
                         brd_sent++;
         }
+        RELEASE_CONFIG_BUFFER(buf);
         return err;
 }
 
@@ -456,12 +457,12 @@ int arping_main(int argc, char **argv)
 
         while (1) {
                 sigset_t sset, osset;
-                unsigned char packet[4096];
+                RESERVE_CONFIG_UBUFFER(packet, 4096);
                 struct sockaddr_ll from;
                 socklen_t alen = sizeof(from);
                 int cc;
 
-                if ((cc = recvfrom(s, packet, sizeof(packet), 0,
+                if ((cc = recvfrom(s, packet, 4096, 0,
                                                    (struct sockaddr *) &from, &alen)) < 0) {
                         perror("recvfrom");
                         continue;
@@ -472,5 +473,6 @@ int arping_main(int argc, char **argv)
                 sigprocmask(SIG_BLOCK, &sset, &osset);
                 recv_pack(packet, cc, &from);
                 sigprocmask(SIG_SETMASK, &osset, NULL);
+                RELEASE_CONFIG_BUFFER(packet);
         }
 }